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REVISION CH (1,2) Q1: Speed of car 7 mm/µs is equal in m/s Q2:electronic door opens for 3600µs express this time in : 1- hours 2- minutes 3- mille minutes Q3:asquare of edge 20 mm find its area in SI units Q4:The density of mercury 13.6g/m3 what is the density of mercury in MKS system ? Q5:How many millimeters in kilometer? Q6: using the dimensional analysis check the validity of the equation 1/t=x/at3 Where t is time ,x distance ,a acceleration Q7:How many significant figure in each of the following numbers? a- 0.04 b- 10.0001 c- 0.000025 d- 700 e-300×108 f-2.1+1.10042